Machine for the automatic manufacture of wheels with angular or double helical teeth.



J. (JRUNDSTEIN. MACHINE FOR THE AUTOMATTC MANUFACTURE OF WHEELS WITH ANGULAR OR DOUBLE HELICAL TEETH.

APPLICATION FILED IAN. T4, I913,

Patented J mm 6, 1916.

I I SHEETS-SHEET I.

zwAimm w z I Pzlrvntvd J unc 6, 1916.

J. GRUNDSTEIN. HE AUTOMATIC MANUFACTURE OF WHEELS WITH ANGULAR OR DOUBLE HELICAL TEETH.

APPLICATION FILED JAN. 14, l9i3T E Q W N m N $2 x n 1..T.|\ TH... w w .Q F UH .5 3y 2 U M U Me TTUT. T|TTT..T l TTTTT TTWQTT N a 1. 2 \T TTWLLTITTTT" TI TT|T|T||T|TT|TT Tl: {TTTTTTITTTTITTTTTTIT {IT {TAU u a. T I Q FT... f R T1 0 m mN a 0N k .R T T UTE- v r W R R 1 RN I L m NM l 5 m fimi r 6 5 N a w m i .f/n/cw 1 f w cw MACHINE FOR T gNm iii

AkPLi -fi lh man MAQHINE FOR THE AUTOMAHC MANUFACYU J. GRUNDSTEIN.

MACHINE FOR THE AUTOMATIC MANUFACTURE OF WHEELS WTTH ANGULAR 0R DOUBLE HELICAL TEETH APPLICATION FILED JAN- IM 1913- 1,185,657. I Patented June 6,1916.

H SHEETS-*SHEET 6.

1. (SRUNDSTEIN. 4 WNJFIJTH'HZ I 0F WHEELS WITH ANGULAR 0R DOUBLE HEUCAL TEETH.

Patented J 11110 6, 1916.

H SHEETS-SHEET 7- :LED JAN M. 1913- J. GRUNDSTEiN. NUFACTURE 0F WHEELS WlTH ANGULAR 0R DOUBLE HELICM. TEETH APPLICATION HLED Mn. 14, 1913.

MACHlNE FOR THE AUTOMATIC MA Rm 1. 98 1. ,E 6 8 3 S m... ni Du l a D1 I. GRUNDSIEIN.

mcnme ron THE AUTOMATIC MANUFACTURE OF wums wnu ANGULAR on oou APPLICATION FILED IMHH. I9I3.

Patented J une 6,1916

1,185,657 n snce1ssnan9 sue HELICAL TEETH.

J, GRUNDSTEIN. UTOMATC MANUFACTURE O WHEELS WITH ANGULAR 0R DOUBLE HELICAL TEETH.

APPLlCATlON FILED JAN. H 1M3. 1 ,185,657, Patented June 6, 1916.

ll SHEETS-$HEET I0- MACHKNE FOR THE A INVENTOR A TTORNE Y8.

J. GRUNDSTEIN. MACHINE ron THE AUTOMATIC MANUFACTURE OF WHEELS wnu ANGULAR 0R DOUBLE NELICAL TEETH.

APPLICATION HLED IAN. 14, I9!!!- Patented June 6,1916.

H SHEETS-6H! ll.

III VEII T00 nmmri.

UNITED STATES PATENT OFFICE;

JULIUS GBUNDSTEIN, OF ETTLINGEN, GERMANY, ASSIGNOR TQ MASCHINENFABBIK LORENZ, OF ETTLINGEN, GERMANY, A FIRM.

MiACHII IE FOR THE AUTOMATIC MANUFACTURE OF WHEELS WITH ANGULAB OR DOUBLE HELICAL TEETH.

T 0 allwkom it may concern Be it known that I, JULIUS Gnnnosrrsm, a subject of the Emperor of Russia, residlng at Ettlingen, Grand Duchy of Baden, 111 the German Empire, have invented certain new and useful Improvements in Machines for the Automatic Manufacture of \Vheels with Angular or Double Helical Teeth, ofwlnch the following is a full, clear, and exact description.

This invention relates to machines for the automatic manufacture of wheels with angular or double helical teeth in which the milling cutter describes a rectangular movement, andthe blank is turned to andfro during the milling, in accordance with the angle of pitch of the angular teeth.

It has for its object to provide a machine enabling the division of the pitch circle to be automatically effected, and the'double helical teethto be automatically cut, in one opera-- tion, which was hitherto impossible in the machines 'of'that kind with which I am familiar.

To that end, the invention consists in the new arrangement and combination of the single machine'parts, more particularly ofv the reversing and feed device, as will be hereinafter described with reference to the drawings, in order to move the milling cutter alternately from the driving gear for the blank and the, driving gear for the milling spindle, iii the direction of the axis o the blank and at a right angle to the same,

as well as to turn or swing the blank to and fro and to advance it.

A construction according to this invention s illustrated by way of example in the accompanying drawings.

Figure 1 shows the general arrangement of the machine in front elevation. Fig. 2 is an end elevation of the machine seen from the left in Fig. 1 and drawn on an enlarged scale. Fig. 3 is an enlarged longitudinal section through the longitudinal slide adjustable parallel to the axis of the blank, on line I-II of Fig. 8. Fig. 4 is a front eleva tion of the device, mounted in the longitudinal slide, for controlling the milling cutter or the longitudinal and the transverse slides. Fig. 5 is a section on line III-IV of Fig. 4. Fig. 6 is an edge view of axontrol disk seen at a right angle to Fig. 7 is a front elevation ofcggdoqg tudinal slide," some Patented June 6, 1916.

' Application filed January 14, 1913. Serial No. 741,915.

parts being shown in section. Figs. 8 and 8 show the two slides and a portion of the machine in plan. Fig. 9 is a section on broken line VVIVII of Fig. 1.. Fig. 10 is a vertical section on line VIIIIX of Fig. 9. Fig. 11 shows diagrammatically the I driving gear of the blank. Fig. 12 is a. detail sectional view of a part of the mechanism for rotating the blank holder. Fig. 13 is a side elevation of the mechanism shown in Fig. 12. Fig. 14: is a detail sectional view' showing the mechanism of Fig. 12 in end elevation. Fig. 15 is a similar View to Fig. 14, showing the means for locking the blank feeding means. Figs. 38 are drawn on approximately the same scale, and the scale of Figs. 9 and 10 is somewhat smaller than that of Figs. 38.

The blank A (Fig. 1) is' mounted in the known manner between a movable head stock C adjustahly mounted in the machine frame B, and a dividing head D, and, more particularly when it is a question; of large blanks, can be secured in its central position by means of supporting rollers E.

The machine is driven either from a line shaft by means of a belt F for which purpose the machine is provided with a pulley F, or it can be driven in any well-known manner by means applied in the place of the p ulley F.

a groove on thesame, rotates an oblique spindle H. (Figs. 1 and 2). The latter transmits its rotation by means of a'bevel wheel gear H to the spindlel of the milling cutter P for cutting the wheel. The spindle 1 is adjustahly guided in the bevel wheel H by means of a. groove (Fig. 8). The gears G", H, H? and the oblique spindle -H are preferably surrounded by guard cases.

For moving the millin cutter P normally or parallel to the axis 0 the blank, a transverse slide 2 and, a longitudinal slide 9 (Figs. 1 and 2-) are provided, the movements of which are controlledby means of a. driving and controlling device hereinafter described.

The milling cutter spindle 1 is mounted in thetransverse slide 2 which is adjustable normally to theaxis of the blank, in guides 3 of the longitudinalslide 9. The steering sake of greater clearness.

device for the movements of the two slides is arranged in the longitudinal slide 9.

The spindle G (Fig.1) continuously rotates, by means of a spur wheel gear J, the spindle 5 mounted in the machine frame, with the same number of revolutions and always in'the same direction. In the same way, the spindle 4 (Figs. 2 and 3) mounted in the longitudinal slide 9, is always and continuously rotated in the same direction from thespindle (l, namely by means of the spindle G obliquespindle H and a worm 4*(Fig. 2) mounted on the latter and transmitting its, rotations t0 the toothed wheel 4* (Figs. 2 and 3) of the spindle 4, by means of a toothed wheel gear mounted on the slide 9, but riot shown separately for the From the two spindlesA and 5 are obtained all the movements ofthe two, slides and of the blank, as will be hereinafter described.

A worm 7 connected to a spindle 6 (Fig.

' 3) mounted in the slide 9, rotates a wormwheel nut, 8,. (F 3) mounted in the cross slide 2 and moving the slide 2 to or fro normally to the axis of the blank, in accordance with the direction of rotation given to it.

The movement of the longitudinal slide 9 is obtained by means. of a worm wheel nut 11 (Fig. 3) mounted on the screw spindle 10 secured to the machine frame, which nut is rotated to the rightor to the left or stands still, this" being effected by means of the coupling 12, the bevel wheel gear 12, 12*,

12 the spindle 13 mounted tninsversely in the longitudinal slide 9, and the worm 13 mounted on the said spindle. according to the settingof the coupling 12.

The cross spindle 13 transmits its rotution at the same time to the grooved spindle 5* (Figs. 1-3 and i1) mounted in the machine frame. To that end, on the cross spindlc 13 is mounted a, bevel wheel 13 (Fig. 11) engaging with a bevel wheel 13 mounted in'the slide 9, so that it cannot move. axially, but can rotate. The bevel wheel 13' ismounted in a longitudinally adjustable manner on the grooved spindle 5 in the groove 5 so that it transmits its rotary motion to the said spindle 5 which effects the swinging of the blank sinmltaimously with the longitudinal advance "1- the milling cutter, as hereinafter described.

For reversing the directionof rotation of the spindles 6 and 14, couplings 15. 16, 17 and 18 (Fig are provided. By means of the couplings 15 or 17, the spindle ll or the spindle 8, can be coupled with the spindle 21* or 22 respectively driven from the spindle & by means of change wheels 19 21 or 20, 22, so that the spindle i or 14 will be driven from the spindle -l. When the spindle'tl is'couplcd in that way to the spindle 4, the cross slide ilu'ill be the blank, may cut out from the blank the tooth gap to be made.

The toothed wheels 22' or 23 mounted loose on the spindles 6 and 14, can be con nected to the said spindles by means of the coupling 16 or 18 (Fig. 3). The wheel 23 is driven from the spindle 5, the rotation 5 ofthe latter being transmitted by the bevel wheels 5*,5 (Figs. 3 and 11) to a short cross spindle 5, and from the latter, by means the worm wheel gear 5, 5, to the hub of the wheel 23. In order to enable the slide 9 to be moved at the same time relatively to the spindle 5, the bevel wheel 5 mounted in the slide 9 in a-rotatable but not longitudinally adjustable manner, is adjustable on the spindle 5 in the groove 5. This transu'iission device between the spindle 5 and the toothed wheel 0n the spindle 14, has been omitted in Fig. 2 of the drawing, for the sake of clearncss.

The rotation of the wheel 23 is transmitted by means of the intermediate wheel 25 to the toothed wheel 22*.- By means of the said wheels 22 and 23, the spindles 6 so that at the end of the longitudinal ad- 'vance of the slide 9, the milling cutter, moving away from the blank in the horizontal direction, comes out of themilled out tooth gap or returns to this disengaged position, parallel to the axis of the blank, in the direction opposite to the previous longitudinal advance (to the right with reference to Fig. 1), to its initial position. Owing to the couplings 15, 16, 17 and 18 connecting in a suitable sequence the spindles 6 and 14 to the driving, spindles 4 and 5, the milling cutter l executes therefore automatically a movement in the shape of a rectangle hereinafter more fully described. For those movements of the milling cutter P, during which it has no work to do, it is preferable to provide greater speeds.

The couplings 15, 16, 17 and 18' are controlled by means ofdouble-armed bifurouted levers 27 mounted in the longitudinal slide 9 on pins 27 (Figs. 35). The outer arms of the lovers 27 are connected together in pairs by means of springs 28 having the tendency to turn the bifurcated lovers 27 in such manner that they exercise on the couplings a pressure having the tendency to throw. them into gear. This throwing into gear or engagement is however prevented by the operating or feed levers 28, 28 28 and 28*.connected to the lovers 27 and extending in the opposite direction to the outer arms of the levers 27. The operating levers 28, 28, 28 and 28 engage with their ends'from both sides with grooves 29 or 30 of control disks 29 and 30 arranged between the levers 28 and 28 on the one side and 28 and 28 on the other side, on a spindle 34. The

grooves hold the levers 28, 28, 28 and 28 together in opposition to the tension Of tlIB springs28, in such a manner that the couplings 1-5-18 remain out of engagement.- Each of the circular rooves 29 or 30 provided on' the outside 0? the disk 29 or-30, is provided in the radial direction with a recess or a widened portion 31 or 32. lhe widened portion 31 of the groove 29 of the Qdisk 2951s arranged at an angle of 90 relaof the disks.

their spindle .spindle 3i oi the disks.

tively to the widened portion 32.of the groove 30 of'the disk 30. If durin the rotation .of the disks, one of the le vers :28 .-28

engages with its, end with such a. recess 31 or 32, it will be turned away from the spindle 34, which will bring about the throwing into gear of the corresponding coupling by the corresponding bifurcated levers 2 Y In order to throw consecutively into gear the couplings 15, 16, 17 and 18, the controls ling disks29 andiiO secured together, are intermittently rotated. providing on the circumference of the d isks, or of the drurnlike body'constituted by the same with the assistance of the disk. 38,

staggered cams or tappets vo '33, 0 and (l gs. 4.-6, which can engage with a stop 38 adpisteble parallel to the "pindlc 3-12 of the d according the said step is brought into the path of the cams. The rotation of the disks 2i) and 30 ohraincd from the spindle 5, or from the bevel. wheel 34: connected to an intermediate wheel .(Figs. 3-4i) driven fron'i the spindle 5, 1 the said bevel wheel bevel wheel 35 (Fig.

coupling dis '1 38 are pressed from both sides by thev spring? 3!? friction or coupling disks 40 mountei' non-rotatable but longitudi nelly adjustable manner on the spindle 2H,

so that the rotation of the wheel 25 or of the 2 r I i a ndle is t [nit-ted to the controlling d 'kliody. v-rh rthe stop releases one of the cams i --33. .Vhen, on the contrary,

This is effected by tuna sampling.

vloosely mounted on the spindle 56.

the controlling disk body is stopped by the 7 stop 36 engaging with one of its cams, the friction disks 40 will slide on the disk 38, without driving the latter.' I

For the purpose of shifting the stop 36 (Figs. 4, 7 and 8), the latter is secured-to a toothed rack 41 engaging with a toothed wheel 42 controlled hymeans of a vertical spindle 43, of a toothed Wheel- {14, of a toothed rack 15, of toothed wheels l6, 47 on the vertical spindle 47, ofa toothed rack 48 and .of a toothed wheel 49, either by the longitudinal; or by the cross slide (Figs. 7 n

In the longitudinal slide 9 is-adjustably mounted a toothed rack 50 (Fig. 8) engaging with a toothed wheel 51 secured to the 7 vertical spindle of the toothed wheel 49. The ends of the toothed rack 50 form stops and at the end of the longitudinal move ments of the slide 9, strike the stops 52, 52 adjustably mounted on the machine frame. The toothed rack 18 can be also shiftedby means of stops 53 and 54 provided on the cross slide 2, so that the stop 36 can release the controlling disk body 29, 38,30 also when the slide 2 is shifted.

The swinging or turning of theblank required for producing angle shaped or double helical teeth is derived from the spindle 5 (Figs; 1, 3, 9,-1.0 and 11) which is actu-.

sled from the spindle 14 so that the said turning takes place simultaneously with the longitudinal movement of the slide 9- as. the loi'igitudinal movement of the slide is also derived from the spindle 14. The driving device for the blank. which is mounted on the right hand end of the machine (Fig. 1), consists of a reversing device constituted by two bevel wheels 55, 55 (Fig. 9), mounted loose on a spindle 5G and driveirby means of a bevel wheel 56 which (nu bealternatel'y brought into engagement with one or the other of the two bevel wheels 55, 55. The shifting and the rotation of the bevel wheel- 56 are effected by means of a worm gear'71 I which receives its right or left hand drive from the grooved spindle 5 by means of the bevel wheel gear 72. 73 of the spindle 74, the toothed wheels '75, 76 and the spindle 77.

The bevel wheels 55 and 55 are both carried by disks which are united with a drum 55" and a. toothed wheel 57 to form one body Two grooves and are provided on the outer surface of the drunrJJ-i theends; of which gmovesdo not meet, but are connected by ZLI'C'lbSlUiPQtl grooves 55 so that a guiding groove 55", 55, closed on" itself. is obtained, in which groove engages the tailpiece of the spindle of the driving wheel 56. The toothed wheels 55.nnd 55 move parallel to the guiding groove and are connected together by arches'haped' teeth 55 If the driving Wheel 56 meshes with the tdothed wheel 55, the toothed wheel 57 is rotated in one direction until the Wheel 56 leaves the part 55 of the guiding groove,- passes the arched part 55 and enters the part 55 of the guiding groove, when the wheel 56 comes into engagement with the toothed wheel 55. The direction of rotation 56 from one part 55 of the groove into the,

other part 55 thereof, and conversely. Re versing gears of this kind are known in themselves. The toothed wheel 57 secured to the bevel wheel 55 of the reversing device, is in engagement with a toothed wheel 58 of a spindle 58, which, by means of intermediate wheels 59, 59 and 60, drives the spindle 56 on which the reversing device is mounted. The movement of the spindle 56 is transmitted through differential gear subsequently described and spur gears 62 and 63 (Fig. 10), to a spindle 63 and a worm 64: (Fig. 10) mounted on the same and engaging with a worm wheel 65, to the spindle 65 of which is also secured the dividing head D of the blank A.

The turning of the blank is operated as follows: Assuming that'the bevel wheel 56 is in engagement with the bevel wheel. 55 and that there is a connection between the driving spindle 4 and the spindle 14, the

- connection produced will rotate the spindle 77 and the bevel wheel 56 which rotates the bevel wheel and consequently also the toothed-wheel 57 in one direction. At the same time the milling cutter has started its longitudinal working travel and the cutting of a tooth gap. p

When the bevel wheel 56 reaches one of the arched parts 55", the bevel wheel56 with its driving mechanism will followthe curve of the arched part, the casing carrying the driving mechanism moving on the spin dle 77. Owing to the rotation of the bevel wheel 55, the wheel 65 and the blank fixed on the dividing head D, will be turned, the rotation of the bevel wheel 55 being transmitted by the spindle 58, change wheels 59,

59, 60, spindle 56, a diilerential gear 69, 68, 67, 66, spindle .62, dividing change wheels 62,63, spindle 63, and the worm 64, to the wheel 65. The differential gear 6669 forms here merely a connecting member between the-two spindles 56 and 62 and rotates as a rigid whole. In this way, the dividing change-wheels 62, 63 are also utilized for turning the blank. j

As long as the bevel wheel 56. drives the bevel wheel 55, the wheel 65 will be rotated in one direction, that is to say, the blank meets;

-turned in one direction, until one of the arched parts 55 moves the wheel 56 away from the bevel wheel 55. In this wayis produced the first flank of the double helical tooth. At the apex of the corresponding arched part 55 the turning movement of the reversing gear, and of the wheel 65, and

this backward turning of the blank, the

second flank ofthe double helical tooth is produced. It goes without saying that the whole double helical tooth is the resultant of the longitudinal movement of the milling slide and of the simultaneous turningfor ward and backward of the blank. thcsecond flank, and therefore the whole double helical tooth gap 'is finished, the connection between the s indle 4 andthe spindle 14 is interrupted. This stops, of course. the longitudinal working travel of the milling cutter, and the turning mpvement of the blank.

\Vhen the milling cutter is"witl1dra\vn' from the tooth gap just cut, the longitudinal milling carriage is quickly brought back by the spindle 1 being connected to the blank driving spindle 5. A turning to and frobf the blank then takes place in an exactly similar manner during the idle longitudinal travel of the milling cutter. 1

Almost simultaneously with the throwing into gear of the coupling 18, is thrown into gear also the coupling 84, whereby the wheel 65,"and the blank, is given during the idle longitudinal return of the milling cutter by the mechanisms 5, 5, 5 5, 78, 79, 80., S1. s2, 83, 81 85, 86, 70, as), cs, 07, 66, c2, 63 andG, an additional rotaryniotion which is,addcd by the differential gear 66 69 to the turning movement of: the blank as a feed advance. Owing to this additional feed motion, the blank is advanced in such manner that when the longitudinal idle return ofthe milling cutter is finished, or when the transverse working advance of the same begins, it is opposite not the entrance point of the tooth gap which has'becn. just milled, but a point which is distant therefrom to the extent of one pitch. If, after the couplings 84 and 18 have been disconnected,.the working feed or the 'working movement of the milling cuttercontinues,

the next following double helical tooth gap When will be cut in the blank which, for the pur- 4 pose of producing the broken helical 'line,".-i s turned forward and then backward.

' the to obtain the angle.

of th The result of the cooperation of the change wheels 59, 59 and 50 with the differentially driven dividing change wheels 62, 63 during the idle longitudinal return e milling cutter is that the milling cutter does not movein the path of the tooth gap cut from left to right, but in an anlar path (broken helical line) parallel to cut tooth gap, at a distance from it of one pitch.

The change wheels 62 and 63 are division change wheels. But they also fluence for obtaining the angle. The Wheels 5", 5 and are only transmitting wheels for driving the automatic division apparatus of the spindle 5. The worm spindle movements can take place simultaneously during the return stroke of the cutter slide.

The differential gear hereinbefore red to is arr 56d and operates as folengage the bevel wheels 67 and 68 of the differential gear (Figs. 9 and 11). The

are carried around by the shaft 56 and are also in engagement with the driven by a spur wheel 70 secured toit. The drive of the spur wheel 70 is derived from the spindle 5 of the machine in a suitable manner, for instance y means of the spur wheel 15 and 11)- mounted on th i wheels 5, 5', the spindle 78, bevel 79, 8Q, spindle 81, the wheels 82, 83, the

coupl ng 84, the spindle 85 and the toothed wheel 86, in such a manner that the wheel 70 moves only when the slide 9 is operated throwing into gear of the coupling 18.

- coupling84is acted on by a spring 8% whic tends to keep the coupling members engaged. The movable member of the coupling 84 carries a cam piece 84, said cam piece being adapted to he engaged by a le ver 84, the pirrof said lever cngagingthe face Of the 0am piece as it rotates and withdrawing the 7 thereby permitting wheel 83 to run loosely on its shaft 85. Secured to the wheel 70 is a drum 70, said drum being formed with a recess 70 in its periphery, Mounted to turn with the drum 70 is a gear 70 which engages a gear 70" mounted secured to the main frame. err:

atter gear is a nil locking disk 70 winch is have an inis a locking lever 84, is adapted to engage in the locking recess in the drum 70, this latter lever serving to stop the drum the instant the coupling 84 is the link and crank arm connected to t e ter from the blank, at which point the coupling 18, hereinbefore described, is thrown into engagement to s art the return idle movement of the cutter. It is during, this return idle movement that the feeding erations of the change wheels 62 and 63 take place. The rock shaft 70' may be operated in any suitable manner and from any part of the mechanism, it being only necessary that the lever 84 be moved outwardly to release the coupling 84, and that the locking pawl be moved outwardly to release the lever 84" at the properly timed interval. It is manifest that when the rock shaft 70 is moved in the proper direction to release the coupling 84 the locking pawl 70 will be disengaged from the lever 84 and said lever may then be moved outwardly with the lever 84, the cross head on lever 84" engaging the When the slots in the locking disk and drum register will snap them, thereby wardlv lever 84 and causing it to engage the (rain piece on the coupling. The slots in the locking disk and drum are long enough to permit the rotation of the c 31 piece and the consequent withdrawal or connection of the coupling. As soon as the coupling is disconnected the locking lever t l snaps into place and prevents furi er rotation of the drum 70. At the sans,

carrying in- The dividing change wheels 62 and 63* are calculated according to the number of teeth to be milled, and mounted on their spindles while the wheels 59 and 60 are ob tained for each angle by calculation.

In that arrangement of the change wheels, the angles of the wheels to be milled for different numbers of teeth will "be exactly identical.

In the arrangement according to this invention, the dividing change Wheels 62, 63 areexchanged, to su t the number of teeth,

for two wheels meshing with each other in which therefore the pitch is the same, while the change wheels 59, 60 which are chosen or calculated equal to the value tan. a or in roportion to the same, are used for both wheels to be milled. If in one wheel it is necessary to deviate from the angle a selected, or if it is possible to reach the same only approximately, as the value tan. a cannot be formed with the proportion of the numbers of teeth of the available change wheels, the deviation from the angle a is also transmitted to the second wheel to be milled, as the change wheels 59, 60 selected for one wheel, are used also for the second wheel. The angle a which is obtained in the two wheels 1s therefore always the same.

The working of the machine is as foll0Ws:-The milling cutter P is for instance assumed, with reference to Figs. 18 to have effected a cut with the movement of the slide 9 toward the left and to have already covered at the proper depth the whole width of the blank, and the coupling 16 is assumed to have been thrown into gear in the manner shown in Fig. 3, owing to the lever 28 (Fig.

7 4) having sprung into the recess 32 of the groove 30 of the disk 30. In that way,the

toothed wheel 22" has been connected to the spindle 6, and the worm wheel gear 7,8 withdraws the cross slide 2, and therefore the mil ing cutter, from the blank, until the adjustable stop 54(Fig. 8)provided on the slide 2, strikes the stop 54 connected to the toothed rack .48, and in that way imparts to the tooth rack a movement in the direction of the arrow 1. This movement of the toothed rack 48 is transmitted by means of the wheels 47 and 46 to the toothed rack 45, and the move ment of the latter-by the wheels 44 and 42- to the toothed rack 41, whereby the stop 36 provided on the latter, will be shifted in the direction of the arrow 2, that is to say, in the direction of the, axis of the controlling disk body 29, 38, 30, so that it comes out of the path of the cam 33 (Figs. 4 and 6) or the controlling disk body "engaging with it and the latter can make a quarter of a revolution, until the next calnBId, in the path otvxhich the stop 36 is now situated, strikes the said stop 36, and in that way again stops the controlling disk body. OW- ing to this; quarter of a revolution of the disk, the coupling 11) disengaged by the renewed inward pressure of the lever 28, and the coupling in thrown into gear by the engagement of the lever with the recess 31 of the i'l'ome ill of the: disk 29, and in that way the spii'i lle it is connected to the tUOtllPii wheel 23. The longitudinal slide 9, and with it, of course. the milling ci- 'uer previously moved out otthc blank, will be now moved parallel to the axis of the. blank, with reference to Figs. 1 and 8, to the right. During this loi'igitudinal move ment of the slide 9 to the right, owing to the engagement of the coupling Eli (Fig. 9), the dividing device for the blank will be coupled at the same, time to the continuously rotating spindle 5. In that way the wheel Tl) (Fig. 9) is rotated, and consequently the blank is turned to the extent of one tooth division. At the end of the right hand movement of the slide J, the toothed rack 50 strikes the stop Fri situated on the right in Figs. 7 and 8, so that it is cortespond ingly shifted relatively to the longitudinal slide. This movement is transmitted by the wheels 51 and 49 (Fig. 8) again in the direction of the arrow 1. to the toothed rack 48 which in that way shifts the stop 36 still farther to the side, in the direction of the arrow 2, so that the cam 33 at the moment engaging with the stop 36, is deprived of its abutment, whereupon the controlling disk body thus released, is further rotated. After another quarter revolution of the con trolling disk body, the cam 33 strikes the stop 36, so that the controlling disk body is again stopped. In that position of the parts, the end of the lever '28" is in engagement with the recess of the disk 30, the coupling 18 is out of gear and the coupling 15 in gear. In that way the spindle 6 is connected to the spindle 4, and the slide 2 is again advanced toward the blank, until the milling cutter has worked into the blank to the desired depth. At the end of this new advance of the slide 2, the latter strikes with its stop 53 against the stop 53} of the toothed rack 48, whereby the latter is moved in the direction opposite to the previous one, that is to say, in the opposite direction to the arrow 1, which results in the stop 36 moved back in the direction opposite to the arrow 2. and consequently in the cam 33 and the contr lling disk body so that thelntter can turn forward again. Owing to this rotation, the coupling 15 is then thrown out of gear and the coupling 17 into gear, owing to the engagement of the being The 'same time the milling cutter produces the tooth section in the blank, whereupon the working just described is again repeated.

An important characteristic feature of the machine according to this invention 15 that during the return of the milling cutter to its initial position, that is to say, during the movement of the milling cutter in the direction of the axis of the blank, the driving of the blank is not reversed, but the dividin device of the blank becomes opera tive. his results first of all in the; advantage that two idle movements, the swinging or turning of the blank to the extent of one tooth division or circular pitch, and the movement of the milling cutter into its initial position, are simultaneous, so that in that way time is economized, which is equivalent to a reduction of the idle movements.

Another advantage consists in the fact that it is possible with the machine awording to this invention to make wheels which are-bounded on both sides by a solid rim or flange, m which therefore the milling cutter cannot come out of the tooth gap by a lateral movement. In order to make the manufacture of such wheels possible, it is not suiiicient to remove the milling cutter completely out of the tooth gap by a movement normal to the axis of the blank, but the milling cutter must also be advanced during its movement toward the blank, as the milling cutter during that movement must penetrate into the blank and cut out material from the same.

The construction described and illustrated is a milling machine for the manufacture of double helical toothed wheels, or teeth in which the helical line is broken. If such a machine is to be used for milling simple or ordinary helical tooth wheels with straight helical line, it is merely necessary to replace the reversing or mangle gear 55 and 55 by a simple bevel Wheel secured to the toothed wheel 57 and always remaining in engagement with the wheel 56 which is then not slidable.

By means of the milling machine, it is possible, of course, to manufacture not only angular or double helical teeth, but, when the reversing-device 55 is not used, also ordinary spur wheels or wheels with a set of teeth on each half of the wheel breadth and the staggered to each other by half a pitch. The controlling device for the milling cutter is therefore suitable also for mill ing machines which are not intended for manufacturing double helical teeth.

The present invention can be used not onl for automatic wheel-cutting machines of the lathe type, 'but also for automatic double helical wheel machines of the mill mg cutter machine type as the mechanisms.

are the same in both types.

I claim:

1. A gear cutting machine comprising a blank holder, a cutter, a slide carr 'ing said cutter, means for mo'vin and from the axis of t main slide carrying the e blank holder, a cutter slide, means for moving said main slide longitudinally of the blank holder, means for operating said slides and a series of clutches controle ling said slide operating means and 0perated by the slides atthe ends? of their movements, whereb the cutter will be advanced to and wit drawn from the blank and moved longitudinally thereof both in the cutting operation and in the idle return movement.

2. A gear cutting machine com rising a blank holder, means'for giving't e blank holder a rotary oscillating movement, means for varying the extent of said oscillations to change the angle of the teeth, an aptomatically operatingmeans to determine the number of teeth to be cut, and means whereby the number of teeth to be cut in a blank may be varied.

3. A gear cutting machine comprising a blank holder, a milling cutter, means for moving the cutter longitudinally of the blank, means for giving the blank holder a rotary oscillating motion during the'cutting movement of the cutter, means for varying the extent, of said oscillation to thereby vary the angle of the gear teeth, and means for automatically feeding the blank to cut the desired number of teeth therein, said means being variable, whercb the number of teeth out in a blank may e varied, the

blank oscillating means and the blank feeding means being independently variable.

4. A gear cutting machine comprising a blank holder, means for rotating the blank holder in a step by step movement, a cutter, a slide carrying said cutter, a main slide carrying the cutter slide, means for moving the main slide longitudinally of the blank, means operated by the main slide to control the main slide moving means, means for moving thecutter slide toward andfrom the axis 0 ated by the cutter slide for cutter slide moving means.

5. A gear cutting blank holder. means for rotating the blank holder in a step by step movement, a cutter, a slide carrying said cutter, a main slide carrying the cutter slide, means for moving machine comprising a' said -sli e toward the blank holder and means oper-- controlling the the main slide longitudinally of the blank, means operated by the main slide to control the main slide moving means, means for movin the cut r slide toward and from the axis of the b ank holder and means operated by the cutter slide for controllingvthe cutter slide moving means, adjustable means for limiting the back-and'forth movement of the cutter slide and adjustable means for limiting the longitudinal movement of the main slide.

6. A gear cutting machine comprising a blank holder, a main slide, means for moving said main slide longitudinally of the blank holder, a cutter slide carried by the main slide, means for moving the cutter slide inwardly toward the axis of the blank holder at the beginning of the cutting movement, means for moving the cutter slide outwardly away from the blank holder at the end of the cutting movement and means for then returning the main slide to its original position.

7. A gear cutting machine comprising a blank holder, a main slide, means for moving said main slide longitudinally of the blank holder, a cutter slide carried by the main slide, means for moving the cutter slide inwardly toward the axis of the blank holder at the beginning of the cutting movement, means for moving the cutter slide outwardly away from the blank holder at the end of the cutting movement, means for then returning the main slide to its original position and a series of devices adapted to be engaged by the cutter slide at the ends of its reciprocating movements to control the movement of said cutter slide.

8. A gear cutting machine comprising a blank holder, a main slide, means for moving said slide longitudinally of the blank holder, a pair of clutches controlling the main slide operating means, means operated by the main slide at the end of its movement in either direction to control one of said clutches, a cutter slide mounted on the main slide, means for moving said cutter slide toward and from the axis of the blank holder and means engaged by said cutter slide at the ends of its reciprocating movements to stop the said slide.

9. A gear cutting machine comprising a.

i, .-....MMW.

cutter, means for moving the cutter slide inwardly at the beginning of the gear cutting operation, means for moving the said slide outwardly at the end of the gear cutting operation, means for moving the main slide back to its original position after the gear cutting operation and means for advancing the blank the distance of one tooth during the return idle movement of the cutter.

11. A gear cutting machine comprisin a blank holder, means for giving the blan holder a rotary oscillatory movement, a main slide, means for moving said slide lon 'tudinally of the blank holder, a cutter sli 0 carried by the main slide, a cutter carried by said cutter slide, means for operating said cutter, means for moving the cutter slide inwardly at'the beginning of the gear cuttin operation, means for moving the said sli e outwardly at the end of the gear cuttin operation, means for moving the main sli e back to its original position after the gear cutting operation and means for advancing the blank the distance of one tooth during the return idle movement of the cutter and means for varying the extent of the rotary oscillatory movement of the blank holder. 1

12. A gear cutting machine comprising a blank liolder, a cutter, means for moving said cutter longitudinally of the blank' 0 holder during the cutting and the non-cutting movement of the cutter, means for giving the blank holder a rotary movement during the cutting movement of the cutter,

and gear wheels for superposing upon the a rotary movement of the blank holder a blank feeding movement during the return non-cutting movement of the cutter, said gears forming a part of the means for rotating the blank holder.

13. A gear cutting machine comprising a blank holder, a cutter, means for moving the cutter toward the axis of the blank, means for then moving it longitudinally of the blank, means for then moving it outwardlyand away from the blank,'means for moving it longitudinally back to its original, position, means for giving the blank holder a rotary oscillating movement during the longitudinal cutting movement of the cutter, and gears for superposing upon the blank turning movement a blank feeding movement, said gears operating with the means for giving the blank holde the rotary oscillatory movement.

14. A gear cutting machine comprising a blank durin said rotary o, iilating move ment, WIIAIJ. for returning the cutter to,,the

plac :of beginning, andg A rs for superposing upon the rotary oscillating movement of the blank holder a. fer-d movement to position the blank for the next cutting opera- ,tion, said gxars forming part of and opereting with the means for giving the blank holder a rotary oscillating movement,

\ll). A gear cutting machine comprisinu a a blank holder means for giving sa id holder a rotary oscillating movement, means for mov ng the cutter across the face of the blame. during said rotary oscillating movement, :1 dalercntial gearing interposed in the blank holler oscillating means, and 2a gears operating said differential ge ring during the. nonotting movement of the cutter to a: the blank holder the distance of one room,

3. A cutting machine comprising a. blank llOlflimeans for giving said holder a. rotary ,illating movement, means for W cutter across the face of the j said rotary oscilaiing move aihlc gears for val ying the ex oscillation of the llank holder, 'ial gearing interposed in the Llr oscillating means, anal rears said differential dui for open ing the in cutting movement a l to snnerposi': a blank feeding in the omnk holder osci I ntting ma a milling gi ii 153mg i'i'ioti n. on ing the man tiny, increment of the val-3mg tl ortrnt ol' m; 5o! ant-ma blank during said rotary oscillating movement, changeable gears for varyin the extent of the oscillation of the blan holder, and changeable gears for varying the extent of the feeding movement, said gears forming a part of and operating with the gears for oscillating the blank holder.

,9. A gear cutting machine comprising a blank holder, means for giving said holder a rotary oscillating movement, means for ag the cutter across the face of the like during said rotary oscillating movement, gear wheels controllingthe' extent of oscillation of the blank holder to give the desired angle to the teeth, gear wheels c0ntrolling the division of the blank into teeth, said gears also serving to oscillate the blank holder for the gear-cutting operation, a differential gearing interposed between said sets of gears, and gears operating said difential gearing during the noncutting movement of the cutter to advance the blank holder the distance of onertooth,said

mowment, said means operating through V the blank holder oscillating means during ihc return idle movement of the cutter.

A gear cutting machine comprising a. blank holder, wheels for rotating the blank holder, means for driving said wheels to mine the blank holder for a partial rotation and then reverse its movement, and men operating through I l wheels to mow the hlank holder 21 our distance upon i ls said reverse movmaz-nl to advance iii-s )lanlc' holder the distan r a one tooth.

ei-gnol ar-liiannheim th' oilth clay of Dewmlmr, 1M2, in the produce of two wit- UHIKIS.

JULIE GH-UND ETEIN.

V2 itnesses:

J can? I I Pr'eirrna Loren Scmmrn. 

